检索结果-南通市图书馆

Extraction of gravitational wave signals with optimized convolutional neural network

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2020年第1期15卷 135-140页

作者： Hua-Mei Luo Wenbin Lin Zu-cheng chen {2.-Guo Huang School of Mathematics Southwest Jiaotong UniversityChengdu 610031China School of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031China School of Mathematics and Physics University of South ChinaHengyang 421001China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesNo.19A Yuquan RoadBeijing 100049China

Gabbard et *** demonstrated that convolutional neural networks can achieve the sensitivity of matched filtering in the recognization of the gravitational-wave signals with high efficiency[***.1.0},1.1.0{1.2.1.)].In this work we show that their model can be optimized for better *** convolutional neural networks typically have alternating convolutional layers and max pooling layers,followed by a small number of fully connected *** increase the stride in the max pooling layer by 1.followed by a dropout layer to alleviate overfitting in the original *** find that these optimizations can effectively increase the area under the receiver operating characteristic curve for various tests on the same dataset.

关键词： gravitational wave convolutional neural networks deep learning

中国西藏发现麝鼩属(劳亚食虫目:鼩鼱科)两新物种

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

兽类学报 2024年第5期44卷 529-550页

作者：陈顺德杨思雨青娇范荣辉唐刻意廖锐郭克疾张梦斐吴南飞刘少英四川师范大学生命科学学院成都610066 四川省林业科学研究院成都610081 国家林业和草原局中南调查规划院长沙410014 湖南师范大学生命科学学院长沙410081 中南林业科技大学生命科学与技术学院长沙410004

麝鼩属(Crocidura)是哺乳动物中物种数量最多的属。中国麝鼩属的分类存在诸多争议,需要进一步开展基础研究。本文整理了灰麝鼩(***)、台湾灰麝鼩(***)、安徽麝鼩(***)、白尾梢大麝鼩(***)、大麝鼩(***)、黑袍麝鼩(***)和2.疑似新种共8... 详细信息

麝鼩属(Crocidura)是哺乳动物中物种数量最多的属。中国麝鼩属的分类存在诸多争议,需要进一步开展基础研究。本文整理了灰麝鼩(***)、台湾灰麝鼩(***)、安徽麝鼩(***)、白尾梢大麝鼩(***)、大麝鼩(***)、黑袍麝鼩(***)和2.疑似新种共8种大型麝鼩1.9号标本,比较了假剥制标本、头骨和牙齿形态,对测量数据进行了主成分分析(PCA)和判别分析(DA)。结合中国及邻近地区麝鼩属物种Cyt b基因的分子系统学和分子物种界定结果,我们描记了两个从中国西藏发现的麝鼩新种,即札达麝鼩Crocidura zhadaensis {1.,Wu et liu,***.和墨脱麝鼩Crocidura medogensis {1.,Wu et liu,***.。札达麝鼩的鉴定特征:头体长69~77 mm,尾长49~56 mm,颅全长2..04~2..74 mm。体色较浅,整体呈褐色。尾距尾基3.4长有稀疏的白色长针毛,尾末端形成短毛束。脑颅扁平,下关节面内侧卵圆孔大,第三上单尖齿(U3.明显大于第二上单尖齿(U2.,第一上前臼齿(P4)原尖附近有一小凹陷。墨脱麝鼩的鉴定特征:头体长67~76 mm,尾长62.65 mm,颅全长2..3.~2..2. mm。体色深,背毛深黑褐色,腹毛黑灰色;尾长,常超过头体长的85%;脑颅饱满,顶骨较隆起;第一上单尖齿(U1.最大,高度约是第二上单尖齿(U2.和第三上单尖齿(U3.的两倍;第一上臼齿(M1.的次尖舌面侧缘延展呈半月形;乳突明显。为进一步厘清中国麝鼩物种的分类和物种多样性,本文编制了它们的物种检索表。

关键词：西藏麝鼩分类形态学小型兽类

Immunogenicity and protective efficacy of DHBV DNA vaccines expressing envelope and capsid fusion proteins in ducks delivered by attenuated Salmonella typhimurium

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2018年第4期17卷 928-939页

作者： liu Si-yang JIA Ren-yong LI {1.-{1. FENG Dai-shen SHEN Hao-yue YANG Cui WANG Ming-shu ZHU De-kang {3. Shun liu Ma-feng ZHAO Xin-xin YIN Zhong-qiong JING Bo {3.G An-chun Avian Disease Research Center Sichuan Agricultural University Chengdu 611130 P.R. China institute of Preventive Veterinary Medicine Sichuan Agricultural University Chengdu 611130 P.R. China Key Laboratory of Animal Disease and Human Health of sichuan Province Chengdu 611130 P.R.China

Duck hepatitis B virus(DHBV) shares many basic characteristics with hepatitis B virus(HBV) and is an attractive model for vaccine development. In this study, DHBV DNA vaccines were designed to express envelope and capsid fusion proteins to enhance the breadth of immune response in ducks. Attenuated Salmonella typhimurium(SL72.7) was used as a carrier and adjuvant to boost the magnitude of immune response. Based on this strategy, novel DNA vaccines(SL72.7-p VAX1.LC and SL72.7-p VAX1.SC) were generated. Growth kinetics, genetic stabilities and relative transcription levels of the L, S and C genes introduced by these vaccine strains were measured before inoculation to guarantee safety and efficacy. The relative transcript levels of the CD4 and CD8 T genes and the antibody levels(Ig Y) in ducks receiving the vaccines were higher than those in single gene delivered groups. Additionally, the copy number of covalently closed circular DNA in hepatocytes after DHBV challenge also provided evidence that our fusion vaccines could enhance the protective efficiency against DHBV infection in ducks.

关键词： fusion DNA genes attenuated Salmonella typhimurium(SL72.7) hepatitis B virus(HBV) duck hepatitis B virus(DHBV) oral immunization

在线全文

学校读者我要写书评

暂无评论

甲醇氧化羰化制碳酸二甲酯产物气相色谱分析

天然气化工—C1.学与化工 2002年第4期27卷 50-52页

作者：王华许红云吴砚会陈庆洪潘胜群陈庆湄西南化工研究设计院成都610225

以Chromosorb 1. 1.固定相 ,气相色谱法分析甲醇氧化羰化制碳酸二甲酯产物中水、甲醇、乙酸甲酯和碳酸二甲酯等组份的含量 ,考察了柱温 ,载气流量对分离度的影响 ,确定了适宜的分析条件 ,并用校正面积归一化法定量。该方法操作简便 ,快... 详细信息

以Chromosorb 1. 1.固定相 ,气相色谱法分析甲醇氧化羰化制碳酸二甲酯产物中水、甲醇、乙酸甲酯和碳酸二甲酯等组份的含量 ,考察了柱温 ,载气流量对分离度的影响 ,确定了适宜的分析条件 ,并用校正面积归一化法定量。该方法操作简便 ,快速 ,精度高。

关键词：甲醇氧化羰化碳酸二甲酯反应产物气相色谱法分析

Electronic and Optical Properties of Rock-Salt A1. under High Pressure via First-Principles Analysis

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第10期50卷 990-994页

作者： ZHANG Wei chen Xiang-Rong CAI Ling-Cang GOU {1.-Quan institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900 China

Electronic and optical properties of rock-salt AIN under high pressure are investigated by first-principlesmethod based on the plane-wave basis *** of band structures suggests that the rock-salt AIN has an indirectgap of 4.53.eV,which is in good agreement with other *** investigating the effects of pressure on the energygap,the different movement of conduction band at X point below and above {1..5 GPa is *** opticalproperties including dielectric function,absorption,reflectivity,and refractive index are also calculated and *** found that the rock-salt AIN is transparent from the partially ultra-violet to the visible light area and hardly does thetransparence affected by the ***,the curve of optical spectrum will shift to high energy area (blueshift) with increasing pressure.

关键词： semiconductors electronic band structure optical properties density functional theory

在线全文

学校读者我要写书评

暂无评论

川北地区大隆组页岩储层特征及勘探潜力

成都理工大学学报（自然科学版） 2024年第3期51卷 361-378页

作者：陈更生王林琪石学文杨雨然朱逸青蒲飞龙杨雪王青徐浩中国石油西南油气田公司页岩气研究院成都610051 成都理工大学能源学院(页岩气现代产业学院) 成都610059 油气藏地质及开发工程全国重点实验室(成都理工大学) 成都610059

以川北地区朝天关口村大隆组典型野外剖面及邻区其他剖面为例,通过野外剖面观察、岩石薄片和微体古生物化石薄片观察鉴定等方法,分析其垂向及平面的岩相及沉积相展布及变化,结合区内已有钻井、地球化学主微量元素、总有机碳(TOC)、物性... 详细信息

以川北地区朝天关口村大隆组典型野外剖面及邻区其他剖面为例,通过野外剖面观察、岩石薄片和微体古生物化石薄片观察鉴定等方法,分析其垂向及平面的岩相及沉积相展布及变化,结合区内已有钻井、地球化学主微量元素、总有机碳(TOC)、物性及微孔隙等参数来探讨其页岩的勘探潜力。研究结果表明:(1.大隆组地层纵向上自上而下发育一套灰色硅质灰岩、灰黑色灰质页岩、灰黑色碳质页岩、泥岩组合,其中大隆组二段硅质灰岩和泥质灰岩中含有大量的菊石、牙形石、放射虫化石,大隆组一段碳质页岩和钙质页岩中则含有少量有孔虫、介形虫、双壳类、腹足类以及腕足等化石;(2.大隆组页岩沉积环境属于缺氧—贫氧咸水环境,利于有机质的保存与富集;({1.大隆组页岩有机质类型为Ⅱ1.、有机质丰度高,处于成熟—高成熟演化阶段,孔隙主要发育粒间孔、粒内孔与有机质孔,大隆组二段黑色页岩孔隙度较高,脆性矿物质量占比高,页岩可压裂性好,具有良好的页岩气富集成藏地质条件。综上分析认为,川北地区大隆组页岩整体具有较好的页岩气资源潜力,可作为下一步页岩气勘探的后备层位。

关键词：四川盆地大隆组野外剖面页岩储层特征勘探潜力

维普期刊数据库博看期刊

Measurement of solar pp neutrino flux using electron recoil data from PandaX-4T commissioning run

在线全文

学校读者我要写书评

暂无评论

chinese Physics C 2024年第9期48卷 1-7,300页

作者： Xiaoying Lu Abdusalam Abdukerim Zihao Bo Wei chen Xun chen Yunhua chen chen cheng Zhaokan cheng Xiangyi Cui Yingjie Fan Deqing Fang Lisheng Geng Karl Giboni Xuyuan Guo chencheng Han Ke Han Changda He Jinrong He Di Huang Junting Huang Zhou Huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin Ju chenxiang Li Jiafu Li Mingchuan Li Shuaijie Li Tao Li qing Lin Jianglai liu Congcong Lu Lingyin Luo Yunyang Luo Wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen Manbin Shen Lin Si Wenliang Sun Yi Tao Anqing Wang Meng Wang Qiuhong Wang Shaobo Wang Siguang Wang Wei Wang Xiuli Wang Xu Wang Zhou Wang Yuehuan Wei Mengmeng Wu Weihao Wu Yuan Wu Mengjiao Xiao Xiang Xiao Kaizhi Xiong Binbin Yan Xiyu Yan Yong Yang Chunxu Yu Ying Yuan Zhe Yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang Yingxin Zhang Yuanyuan Zhang Li Zhao Jifang Zhou Ning Zhou Xiaopeng Zhou Yubo Zhou Zhizhen Zhou Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China New Cornerstone Science Laboratory Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China Shanghai Jiao Tong University sichuan Research {1. Chengdu 610213China Jinping Deep Underground Frontier Science and Dark Matter Key Laboratory of sichuan Province Liangshan 615000China Yalong River Hydropower Development Company Ltd.288 Shuanglin RoadChengdu 610051China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Sino-French institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Department of Physics Yantai UniversityYantai 264005China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 102206China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics University of MarylandCollege ParkMaryland 20742USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China School of Physics Peking UniversityBeijing 100871Ch

The proton-proton(pp)fusion chain dominates the neutrino production in the *** uncertainty of the predicted pp neutrino flux is at the sub-percent level,whereas that of the best measurement is O(1.%).In this study,for the first time,we measure solar pp neutrinos in the electron recoil energy range from 2. to 1.4 keV using the PandaX-4T commissioning data with 0.6{1.tonne×year *** pp neutrino flux is determined as(8.0±{1.9(stat)±1..0(syst))×1.1. s^(-1.cm^(-2.,which is consistent with the Standard Solar Model and existing measurements,corresponding to an upper flux limit of 2..{1.1.^(1.)s^(-1.cm^(-2.at 90%C.L..

关键词： solar pp neutrino flux PandaX-4T electron recoil spectrum

蓬莪术醋制前后改善斑马鱼急性肝损伤的作用机制研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中草药 2024年第8期55卷 2611-2619页

作者：林丽婷王继森高天慧朱宗萍罗益蓉卿莹郭亭君陈元惠廖婉成都中医药大学药学院西南特色中药资源国家重点实验室四川成都611137 成都市药品检验研究院国家药品监督管理局中药材质量监测评价重点实验室四川成都610045

目的基于核因子E2.关因子2.nuclear factor-erythroid 2.related factor 2.Nrf2./血红素加氧酶-1.heme oxygenase-1.HO-1.和转化生长因子-β(transforming growth factor-β,TGF-β)/Smad3.号通路探讨醋制前后蓬莪术改善硫代乙酰胺(thioacetamide,TAA)诱导斑马鱼急性肝损伤的作用机制。方法以醋制前后的蓬莪术为研究对象,建立TAA诱导斑马鱼急性肝损伤模型,将醋制前后蓬莪术水煎液分别设置高、中、低剂量(8、4、2.mg/mL)组,以异甘草酸镁为阳性对照药物组,斑马鱼培养水为对照组,给药72.h后观察斑马鱼幼鱼肝脏形态,通过苏木素-伊红(HE)染色观察肝组织病理变化;采用试剂盒检测斑马鱼幼鱼中丙氨酸氨基转移酶(alanineaminotransferase,ALT)、天冬氨酸氨基转移酶(aspartate aminotransferase,AST)活性及谷胱甘肽(glutathione,GSH)、丙二醛(malondialdehyde,MDA)水平;利用qRT-PCR检测斑马鱼幼鱼Nrf2.白细胞介素-1.(interleukin-1.,IL-1.)、Smad3.Smad7基因表达;Western blotting测定斑马鱼幼鱼Nrf2.HO-1.TGF-β/Smad3.号通路相关蛋白表达。结果醋制前后蓬莪术对TAA导致的肝组织细胞形态损伤具有保护作用。生化结果表明,与模型组比较,醋制前后蓬莪术水煎液组ALT、AST活性及GSH水平均显著升高(P1.0.001.,MDA水平均显著降低(P1.。qRT-PCR结果表明,与模型组比较,醋制前后蓬莪术水煎液组Nrf2.IL-1.、Smad7 m RNA表达水平显著升高(P1.0.001.,醋蓬莪术水煎液高剂量组Smad3.m RNA表达水平显著降低(P1.;其中,与等剂量蓬莪术组相比,醋蓬莪术高剂量组显著抑制Nrf2.Smad3.m RNA表达(P1.,且醋蓬莪术具有促进IL-1.和Smad7 m RNA表达的趋势,但没有显著性差异。Western blotting结果表明,与模型组比较,蓬莪术水煎液高、中剂量组和醋蓬莪术水煎液各剂量组Nrf2.白表达水平显著升高(P1.,蓬莪术高剂量组和醋蓬莪术各剂量组Smad3.白表达水平显著降低(P1.0.001.,蓬莪术水煎液高剂量组和醋蓬莪术水煎液高、中剂量组TGF-β蛋白表达水平显著降低(P1.0.001.;其中,与等剂量蓬莪术组相比,醋蓬莪术各剂量组Nrf2.白表达水平显著升高(P1.,且醋蓬莪术具有抑制Smad3.TGF-β蛋白表达的趋势,但没有显著性差异。结论醋制前后的蓬莪术可以不同程度地改善TAA诱发的急性肝损伤,其作用机制可能与调控Nrf2.HO-1.TGF-β/Smad3.号通路有关。

关键词：蓬莪术急性肝损伤核因子E2.关因子2.血红素加氧酶-1.路转化生长因子-β/Smad3.号通路姜黄素呋喃二烯

Topographic heterogeneity and temperature amplitude explain species richness patterns of birds in the qinghai-Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2017年第2期63卷 131-137页

作者： Chunlan ZHANG qing QUAN Yongjie Wu Youhua {1. Peng HE Yanhua Qu Fumin LEI Key Laboratory of the Zoological Systematics and Evolution Institute of Zoology Chinese Academy of Sciences Beijing 100101 China College of Life Science University of Chinese Academy of Sciences Beijing 100049 China Guangdong Entomological institute (South {1. institute of Endangered Animals) Guangzhou 510260 China Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education) College of Life Sciences Sichuan University Chengdu 610064 China Department of Zoology University of British Columbia Vancouver V6T 1Z4 Canada National Zoological Museum Chinese Academy of Sciences Beijing 100101 China

Large-scale patterns of species richness have gained much attention in recent years; however, the factors that drive high species richness are still controversial in local regions, especially in highly diversified montane regions. The qinghai-Tibetan Plateau （QTP） and the surrounding mountains are biodiversity hot spots due to a high number of endemic montane species. Here, we explored the fac- tors underlying this high level of diversity by studying the relationship between species richness and environmental variables. The richness patterns of 758 resident bird species were summarized at the scale of 1.× 1. grid cell at different taxonomic levels （order, family, genus, and species） and in differ- ent taxonomic groups （Passeriformes, Galliformes, Falconiformes, and Columbiformes）. These rich- ness patterns were subsequently analyzed against habitat heterogeneity （topographical heterogen- eity and land cover）, temperature amplitude （annual temperature, annual precipitation, precipitation seasonality, and temperature seasonality） and a vegetation index （net primary productivity）. Our re- sults showed that the highest richness was found in the southeastern part of the QTP, the eastern Himalayas. The lowest richness was observed in the central plateau of the QTP. Topographical het- erogeneity and temperature amplitude are the primary factors that explain overall patterns of species richness in the QTP, although the specific effect of each environmental variable varies between the different taxonomic groups depending on their own evolutionary histories and ecological require- ments. High species richness in the southeastern QTP is mostly due to highly diversified habitat types and temperature zones along elevation gradients, whereas the low species richness in the cen- tral plateau of the QTP may be due to environmental and energetic constraints, as the central plateau is harsh environment.

关键词： birds habitat heterogeneity Oinghai-Tibetan plateau species richness temperature amplitude topography.